Brief Answer:
Continue the treatment as advised.Avoid new medications if causing itching.

Detailed Answer:
Hello and welcome to HCM
I'm Dr Dinah and I'll be answering your queries today.
From your history you seem to have extremely sensitive skin, which has been further affected by wrong treatment on past occasions.
Presently I am not sure if you are still suffering from acne and rosacea, though it can keep coming back at your age. Never apply strong steroid creams like betnovate on skin esp face, for acne. It is for short term use under strict observation by dermatologist, and only for severe allergies,etc with infection.
Now for the scars, there are several treatment options available, but most creams are strong, and other methods like chemical peels, Lasers ,etc,mostly will react with your sensitive skin. it is important to keep your skin clean, oil free, use products specifically for sensitive skin, without added fragrances and colours. Do not pick on or squeeze any acne.
In case you still suffer from occasional redness, rosacea consult a dermatologist regarding a product called Erythygo gel for face. Lasers also can be considered after observing your skin.
As for your present complaints of repeated sunburn, sun screen does not generally cause reactions, but in future be sure to use a sunscreen with high SPF for sensitive skin, such as neutrogena. Check the details when you purchase.make sure they are hypoallergenic and fragrance free. Reapply every 3-5 hours after sun exposure or sweating.
For now, continue the cetrizine for a few more days till the burning and redness subsides. Apply calamine with aloe vera or a menthol lotion like Sarna 2-3 times to cool the skin. You can apply a mild steroid like fluticasone daily for a week for the allergy to come down. If it is very severe you may need an injection of the same. Metrogyl gel can be avoided as you may be sensitive to it. Minoz tablets must be taken carefully and only if you have no signs of allergy to it and no increase in rashes. if you do not have any blisters or boils at the moment, it is better to avoid the Minoz and metrogyl since you already have burning and itching. Observe and see if it will relieve with just Cetrizine, Calamine and Fluticasone cream.
Stay out of the sun completely till healed. Once it is better, remember to always use sunscreen.
Keep a list of drugs that you are allergic to whenever you see a doctor.
Feel free to upload pics of any new rashes or allergy you have.
Do get back to me with any doubts and clarifications you have.
Take care.

---

Brief Answer:
Follow the tips as advised. AVoid chemicals for the face at present.

Detailed Answer:
Hi XXXX, thanks for getting back to me.
I have not received any images but I shall check on them later as they get uploaded.
Aloe vera and calamine can be applied generously on the skin. It also helps in healing with lesser scarring. Fluticasone will help the allergy so apply once a day only on the rashes for a few days and stop.
Your allergy may have been due to some other creams, dust, sand, plants, new foods, medicines or anything at all that you developed allergy to during your vacation. many allergies get further aggravated on sun exposure. In any case, since your skin is sensitive it is always better to use products suitable for sensitive skin.
Avoid long periods of sun exposure usually between 10am-4pm. At present, don't expose to sun till the entire skin is completely healed. Wear covered clothes.
Sunscreen must be part of everyone's daily routine. It is not only for beaches and vacation time. Make a habit of using it even when you go out for a short while. It will protect your skin from future problems as well. Make it a part of your daily regimen 15-20 mins before going out. Take extra precaution while on vacation and reapply regularly with good water resistant sunscreen.
Don't worry. It just needs a little care.

---